Revert "Deprecate API v2" (#7801)

website/server/middlewares/response.js

@@ -1,28 +0,0 @@
-module.exports = function responseHandler (req, res, next) {
-  // Only used for successful responses
-  res.respond = function respond (status = 200, data = {}, message) {
-    let user = res.locals && res.locals.user;
-
-    let response = {
-      success: status < 400,
-      data,
-    };
-
-    if (message) response.message = message;
-
-    // When userV=Number (user version) query parameter is passed and a user is logged in,
-    // sends back the current user._v in the response so that the client
-    // can verify if it's the most up to date data.
-    // Considered part of the private API for now and not officially supported
-    if (user) {
-      response.notifications = user.notifications.map(notification => notification.toJSON());
-      if (req.query.userV) {
-        response.userV = user._v;
-      }
-    }
-
-    res.status(status).json(response);
-  };
-
-  next();
-};